Yo drawing boundaries means that you got to block them on all fronts.
You can block email addresses.
Giving any outlet of contact is like keeping a number to one of your drug dealers or hanging out in the bar that you would drink at, expecting sobriety the last.
I don't know if you're in a situation to go somewhere else for a couple weeks like a friend's house especially a sober friends house. Turn off your phone on the computer etc and just read go for walks watch a bunch of movies get a part-time job and your friends area.
I had to check into an inpatient rehab to get away from the things of my past because there was no way I was going to have space or freedom to ignore all those things especially my crazy ex and all my drug dealing friends if I stayed at home.
I wish you the best. This is not going to be easy.
Reach out if you need to vent.